Buffer Depth stuff:

Buffer Depth stuff:
new defined values:
BLUEFISH_HW_BUFFER_DEPTH 1
BLUEFISH_SOFTWARE_BUFFERS 4
To easily set the HW buffer depth, and number of software buffers used.
Previous setting of 3 for the HW buffer depth has been reduced to 1,
since almost all hardware tested shows that 1 is sufficient.
( very old machines with poor PCI performance may struggle with a buffer of just 1)

bluefish_consumer_proxy::buffer_depth now returns the correct value,
ie. BLUEFISH_HW_BUFFER_DEPTH
( i have tested this via taking a pic of both screen and SDI display, and confirming that they both display the same frame,
I hope this is the correct use/interpretation of this value)

Queue, Mutex and thread stuff:
Changed the std::queue and std::mutex to use tbb:concurrent_counded_queue, as suggested.
This has greatly simplified the code by removing the mutex's and associated lock/unlock calls.
made the end_dma_thread bool, tbb::atomeic too - should have always been marked as such, or at least volatile.
also added code to specifically set the maximum size for the tbb concurrent queue
Mofified the way we allocate the std::thread for the DMA and present.
thread is now a class member which makes things a bit cleaner too.
removed the mutex and lock stuff from this too.
Startup uses the Dfeined buffer value from top of file.

Routing and card config:
Minor change to the way we woncfigure routing on neutron cards when using the hw keyer, 2nd link ie. the fill only now gets routed correctly.

Hardware Keyer:
Now using the correct Macro to setup the hw Keyer,
Be aware the terminology can be confusing as the the macro refers to the source data, not the process to be applied.
This has been tested with the casper 1080_test.tga file and produces the correct output.
Ie. we see the following text in white.
"Alpha / Key correct: Premultipled
 Linear / Additive"